Patent US4421581A successfully refreshed from Google Patents.
US4421581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single ply roofing system
Assignee: Tamko Roofing Products Inc
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Filing: 1982-04-14
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Granted: 1983-12-20
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Expires: 2002-04-14
Abstract
Abstract The present invention relates to a roofing system employing a combination of silicone rubber layers. The method utilizes a first layer of silicone rubber which is applied directly to the substrate and is then overlaid by a membrane of silicone rubber impregnated fabric. The fabric layer is placed in position before the first layer cures and is then overcoated with a second layer of silicone rubber which serves as a protective outer coating.
Inventors
- 👤 Thomas O. Olsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:13
CPC Classifications
E; E04; E04D; E04D7/00; E04D11/00; E04D11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A method of constructing a waterproof roofing covering over a substrate, said method comprising: spraying a solution of RTV silicone rubber on said substrate; laying a membrane of silicone rubber impregnated glass fiber fabric over said silicone rubber layer before the latter has fully cured; and spraying said fabric with a second layer of RTV silicone rubbr solution, said solution of RTV silicone rubber comprising silicone rubber and a solvent therefore with a solids content of 50% to 70% by weight and a quantity of SiO 2 comprising 90 to 110% by weight of the combined silicone rubber and solvent, said SiO 2 having a particle size of 45 microns or less.
Claim 2
Independent Claim
112 words
A method of constructing a waterproof roofing covering over a substrate, said method comprising: spraying a solution of RTV silicone rubber on said substrate; laying a membrane of silicone rubber impregnated glass fiber fabric over said silicone rubber layer before the latter has fully cured; and spraying said fabric with a second layer of RTV silicone rubbr solution, said solution of RTV silicone rubber comprising silicone rubber and a solvent therefore with a solids content of 50% to 70% by weight and a quantity of SiO 2 comprising 90 to 110% by weight of the combined silicone rubber and solvent, said SiO 2 having a particle size of 45 microns or less.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |